Microsoft® Office SharePoint® Portal Server 2003 Service Pack 2 (SP2) contains significant security enhancements, in addition to stability and performance improvements. Some of the fixes included with SP2 have been previously released as separate updates. This service pack combines them into one update.

Download it at http://www.microsoft.com/downloads/details.aspx?FamilyID=171DC9A7-B4BA-4759-BD64-6B7D851A97EF